M, A.R. et al. 2020. Difference in the Faecal Elastase-1 Concentration between Resectable and Unresectable Pancreatic Cancer. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy. 21, 2 (Sept. 2020), 99–107. DOI:https://doi.org/10.24871/212202099-107.